chore(deps): bump cachix/install-nix-action from 13 to 14 (IntersectMBO#3893)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 13 to 14.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v13...v14)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/flakes-update.yml

@@ -11,7 +11,7 @@ jobs:
     # Borrowed from https://github.com/Mic92/dotfiles/blob/9c2fc2cc98021dd8d42bbb714278785a9a6757c2/.github/workflows/upgrade-flakes.yml
     steps:
       - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v13
+      - uses: cachix/install-nix-action@v14
         with:
           install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210415_76980a1/install
           extra_nix_config: |